Tailwind Nutrition 500ml Soft Flask

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Hydrapak's UltraFlasks™ are designed to conform to the shape of your body, compressing as you drink. This means reduced sloshing and bouncing, less spillage and an easier time sucking out that Tailwind goodness.

The flexibility of the soft flask means it can fit into your existing gear: successfully tested with Ultimate DIrection, Salomon and Nathan vests.


  • Clear Plastic - no more guesswork towards the amount of Tailwind left
  • Collapsible - Perfect bottle to use on multi-stage events or international events, it's only as large as the Tailwind being carried
  • Lightweight - weighing in at just 38g once emptied the flask is light as a feather
  • Pliable - Conforms to any shape, be it your hand, belt or high-tech vest

Dimensions: The hard plastic top of the flask measures in at 8.5 x 6.5cm wide and stands 7cm with the rest of the flask being able to collapse in to the hard top when empty.

Holds up to 500ml

54 Reviews Hide Reviews Show Reviews

  • 5
    First Marathon Soft Flask Success

    Posted by Joe Sallis on 4th Nov 2017

    I was waiting to write this review after trsting the bottle on my first trail marathon - the 27 mile Gordano Round Marathon, here in the Portishead area. While the run itself wasn’t a great success (very painful & slow) the bottle performed brilliantly. Comfortable in my race vest, no leaks, nice wide opening for Tailwind, nice hand-feel, just a great product! Thanks once again Tailwind for such craftsmanship in your execution.

  • 5
    New bottles

    Posted by Alexis Tobin on 20th Sep 2017

    Tidied out 2 new soft flasks with Tailwinds on a 20 mile run. The flasks work well and collapse down as the liquid goes down. Worth a try an an alternative to a plastic bottle .

  • 5
    Soft Flask and sticks

    Posted by Derek McGann on 11th Sep 2017

    Bought as a replacement for my old Salomon flasks. Great wide opening makes them easy to handle / fill during recent marathon and they don't disappear into the pocket on my Salomon vest like the old ones. As described by other reviewers the only disadvantage is a slight rubbing when the bottle is full so took to filling 80% and had no problems after that. Also received extra free sticks to try out the different flavours. Very appreciated..... as was the neck warmer.

  • 5
    Great flask

    Posted by Peter Turner on 7th Aug 2017

    Bought as an extra to go with my UD vest. Although ultimately made by the same company the Tailwind flask feels better quality. The cap screws on better than the UD flasks and they work really well.

  • 5
    Exactly what I needed

    Posted by Gavin Dillow on 31st Jul 2017

    After finding that the Salomon soft flasks flop about in the pockets of my UD vest, I decided to check these out. They're a much better fit even when full, and collapse down incredibly well. The wide neck is an added bonus.

  • 5
    great bottle

    Posted by Teresa Walton on 31st Jul 2017

    great squashy bottle that fits in bg pocket of my running bottoms x holds 500ml so will be plenty on half marathons for ,e